SIL determination: pitfalls found in LOPA studies

This presentation introduces the study of protection analysis layer that is used to provide a more consistent approach to safety integrity level (SIL) assessment suggested by the Buncefield Standards Task Group (BSTG). The Layer of Protection Analysis (LOPA) method has been adopted by industry, which has submitted LOPA studies for its fuel storage overfill prevention systems to the Health and Safety Executive (HSE). This talk presents and discusses a number of example issues identified in the LOPA studies looked at by HSL.